题解

#include <bits/stdc++.h>
using namespace std;
int digit[1000005];
bool type(string s) 
{
	for(int i = 1; i < s.size(); i++)
	{
		if(s[i] >= 'A' && s[i] <= 'Z' && s[i-1] >= '0' && s[i-1] <= '9')
			return false;
	}
	return true;
}
void change1(string s) // excel转RXCY
{
	int C = 0, i = 0, num = 0;
	for(i = 0; i < s.size(); i++)
	{
		if(s[i] >= 'A' && s[i] <= 'Z')
		{
			C = C * 26 + (s[i] - 'A' + 1);
		}
		else
			break;
	}
	while(i < s.size())
	{
		num = num * 10 + (s[i] - '0');
		i++;
	}
	cout << "R" << num << "C" << C << "\n";
	return ;
}
void change2(string s) //RXCY转EXCEL
{
	int i, R = 0, C = 0, tot = 0; //R统计函数C统计列数，tot统计十六进制位数
	bool flag = false; //false表示统计行的数量
	for(i = 1; i < s.size(); i++)
	{
		if(s[i] >= '0' && s[i] <= '9' && flag == false)
			R = R * 10 + (s[i] - '0');
		else if (s[i] >= '0' && s[i] <= '9' && flag == true)
			C = C * 10 + (s[i] - '0');
		else //s[i] == 'C'
			flag = true;
	}
	while(C != 0)
	{
		digit[++tot] = C % 26;
		if(C % 26 == 0)	//特判，余数为0
			C--;
		C /= 26;
	}
	for(i = tot; i >= 1; i--)
	{
		if(digit[i] == 0)
			cout << 'Z';
		else
			cout << (char)(digit[i] - 1 + 'A');
	}
	cout << R << "\n";
	return ;
}
int main()
{
	int n;
	cin >> n;
	while(n--)
	{
		string s;
		cin >> s;
		if (type(s) == true) //excel转RXCY	
			change1(s);
		else 
			change2(s);
	}
	return 0;
}